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Identifies a single IP address accessing an abnormally large number of distinct mailboxes via MailItemsAccessed events, indicating a service principal or OAuth app silently reading mail across the organization using granted permissions. Empty UserAgent combined with high mailbox count indicates programmatic API access consistent with app-based exfiltration.
| Attribute | Value |
|---|---|
| Type | Hunting Query |
| Solution | Hybrid Attack - Cloud & Identity |
| ID | c53bf4ae-bd8b-4c72-b9c3-10baa8c13885 |
| Tactics | Collection, Exfiltration |
| Techniques | T1020, T1537, T1567 |
| Required Connectors | MicrosoftCloudAppSecurity, MicrosoftDefenderThreatIntelligence |
| Source | View on GitHub |
This content item queries data from the following tables:
| Table | Selection Criteria | Transformations | Ingestion API | Lake-Only |
|---|---|---|---|---|
CloudAppEvents |
ActionType == "MailItemsAccessed" |
✓ | ✗ | ✓ |
ThreatIntelIndicators |
ObservableKey == "ipv4-addr:value" |
✓ | ✓ | ✗ |
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